APA (7th ed.) Zitazioa

O'Neill. The Opened Letter. University of Pennsylvania Press.

Chicago Style (17th ed.) Zitazioa

O'Neill. The Opened Letter. University of Pennsylvania Press.

MLA (9th ed.) Zitazioa

O'Neill. The Opened Letter. University of Pennsylvania Press.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.